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Document ID: 10380

Introduction

In some environments, it may be necessary to bundle multiple asynchronous links to act as single link with aggregated bandwidth. This document describes how to configure a Cisco 2500 Access Server to bundle two asychronous interfaces using a virtual template.

This configuration can be used for routers connected by asynchronous lines with external modems or using network modules (built-in modems).You can add additional features to this configuration depending on your needs.

Prerequisites

Requirements

There are no specific prerequisites for this document.

Components Used

The information in this document is based on the software and hardware versions below.

• Cisco 2511 and Cisco 2503 routers in a lab environment with cleared configurations.


• Cisco IOS® Software Realease 12.2(10b) is running on both routers.


• Four external modems.

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.

Related Products

This configuration can be used with any two routers that each have two WAN serial interfaces and are capable of configuring the async interface. WIC-1T, WIC-2A/S, 8 or 16 asynchronous port serial interfaces can be used.

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Configure

In this section, you are presented with the information to configure the features described in this document.

Note:To find additional information on the commands used in this document, use the Command Lookup Tool ( registered customers only) .

Network Diagram

This document uses the network setup shown in the diagram below.

Configurations

This document uses the configurations shown below.

Note: This configuration was tested using Cisco IOS Software Release 12.2(10b) on Cisco 2500 series routers. The same configuration applies to a similar router topology running Cisco IOS software releases starting from Release 11.0(3).

To implement this configuration, you have to configure the following:

• Create a multilink virtual-template number on Router 1.


• Configure ppp multilink under the interfaces on both routers.


• Configure authentication under the interfaces on both routers.

In the configuration used in this document, Router 1 has been configured to only receive calls, while Router 2 initiates the call and connects to Router 1. Both routers are configured for multilink PPP. When the connection comes up, a master bundle is created and both async links are bundled together under a virtual-access interface.

Interfaces 9 and 10 on Router 1 only receive async calls. It is normal not to see interface 9 and 10 when they are part of group-async 1. Be sure to create a multilink virtual template; otherwise, it is possible to connect on the first channel, but not pass traffic (IP Control Protocol [IPCP] closed). Without a virtual-template and multilink PPP, this configuration would work for one async connection, but not for both.

Interfaces 2 and 3 on Router 2 are configured with the physical-layer async command and will accept multilink PPP commands. These interfaces will automatically be removed when they become part of dialer rotary-group. As soon as you enter the dialer rotary-group 3command, the serial ppp multilink command is deleted from the configuration. Use theppp multilink command under interface dialer 3 instead.

Verify

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter Tool ( registered customers only) , which allows you to view an analysis of show command output.

  Router1#show ip route
 &nbspCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
    E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
    i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
    * - candidate default, U - per-user static route, o - ODR
    P - periodic downloaded static route

  Gateway of last resort is not set
    172.16.0.0/24 is subnetted, 1 subnets
  O E2 172.16.1.0 [110/20] via 192.168.0.1, 00:32:54, Virtual-Access1
    10.0.0.0/24 is subnetted, 1 subnets
    C 10.0.0.0 is directly connected, Ethernet0
    192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
    C 192.168.0.0/24 is directly connected, Loopback0
    C 192.168.0.1/32 is directly connected, Virtual-Access1

  Router1#show ppp multilink
  Virtual-Access1, bundle name is Router2
  ! --- Virtualized MP bundle. Bundle name is derived from the username used
  !--- during authentication
  Bundle up for 00:34:48
  0 lost fragments, 0 reordered, 0 unassigned
  0 discarded, 0 lost received, 1/255 load
  0xC8 received sequence, 0xC8 sent sequence
  Member links: 2 (max not set, min not set)
  Async9, since 00:34:52, last rcvd seq 0000C6
  Async10, since 00:32:11, last rcvd seq 0000C7

  Router2#show ip route
  Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
    E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
    i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
    * - candidate default, U - per-user static route, o - ODR
    P - periodic downloaded static route

  Gateway of last resort is not set
    172.16.0.0/24 is subnetted, 1 subnets
  C 172.16.1.0 is directly connected, Ethernet0
    10.0.0.0/24 is subnetted, 1 subnets
    O E2 10.0.0.0 [110/20] via 192.168.0.2, 00:45:10, Dialer3
    192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
  C 192.168.0.0/24 is directly connected, Loopback0
  C 192.168.0.2/32 is directly connected, Dialer3

  Router2#show ppp multilink
  Virtual-Access1, bundle name is Router1
  !--- Virtualized MP bundle. Bundle name is derived from the username used
  !--- during authentication.
  Bundle up for 00:35:10
  Dialer interface is Dialer3
  !--- This Virtual Access Interface used Interface Dialer3.
  0 lost fragments, 0 reordered, 0 unassigned
  0 discarded, 0 lost received, 1/255 load
  0xC9 received sequence, 0xCA sent sequence
  Member links: 2 (max not set, min not set)
  Serial3, since 00:35:10, last rcvd seq 0000C8
  Serial2, since 00:32:29, last rcvd seq 0000C7

  Router1#show caller
  Active Idle
  Line User Service Time Time
  con 0 - TTY 00:12:03 00:00:00
  tty 2 - TTY 1d08h 00:00:00
  tty 4 - TTY 1d08h 00:00:00
    tty 9 Router2 Async 00:43:17 00:00:05
  tty 10 Router2 Async 00:40:36 00:00:15
  !--- First connection
  As9 Router2 PPP 00:43:13 -
  !--- Second connection
  As10 Router2 PPP 00:40:32 -
  !--- MP bundle
  !--- Router2 has two async lines, two TTY, and one virtual interface bundle.
  Vi1 Router2 PPP Bundle 00:43:10 00:00:05
  Router2#show caller
  Active Idle
  Line User Service Time Time
  con 0 - TTY 00:11:36 00:00:00
  tty 2 Router1 Async - 00:00:07
  tty 3 Router1 Async - 00:00:18
  ! --- Second connection
  Se2 Router1 PPP 00:39:58 -
  ! --- First connection
  Se3 Router1 PPP 00:42:39 -

  ! --- MP bundle
  ! --- Router1 has two async lines, two TTY, and one virtual interface bundle.
  Vi1 Router1 PPP Bundle 00:42:39 00:00:01
  Router2#show caller user Router1
  User: Router1, line tty 2, service Async
  Idle time 00:00:16
  Timeouts: Absolute Idle Idle
  Session Exec
  Limits: - - 00:10:00
  Disconnect in: - - -
  TTY: Line 2, running PPP on Se2
  Line: Baud rate (TX/RX) is 115200/115200, no parity, 2 stopbits, 8 databits
  Status: Ready, Active, Async Interface Active, Modem Detected
  Capabilities: Modem Callout, Modem RI is CD,
    Line is permanent async interface, Hangup on Last Close
    Modem Autoconfigure
  Modem State: Ready, Modem Configured
  User: Router1, line tty 3, service Async
  Idle time 00:00:08
  Timeouts: Absolute Idle Idle
  Session Exec
    Limits: - - 00:10:00
    Disconnect in: - - -
  TTY: Line 3, running PPP on Se3
  Line: Baud rate (TX/RX) is 115200/115200, no parity, 2 stopbits, 8 databits
  Status: Ready, Active, Async Interface Active, Modem Detected
  Capabilities: Modem Callout, Modem RI is CD,
    Line is permanent async interface, Hangup on Last Close

    Modem Autoconfigure
  Modem State: Ready, Modem Configured
  User: Router1, line Se2, service PPP
  Active time 23:14:47, Idle time 00:00:00

  Timeouts: Absolute Idle
    Limits: - -
    Disconnect in: - -

  PPP: LCP Open, multilink Open, CHAP (local <--> local)
  Dialer: Connected to 30116, outbound
    Type is IN-BAND ASYNC, group Di3
    Cause: Multilink bundle overloaded

  IP: Local 192.168.0.1
  Bundle: Member of Router1, last input 00:00:01
  Counts: 10194 packets input, 769456 bytes, 0 no buffer
    0 input errors, 0 CRC, 0 frame, 0 overrun
    10247 packets output, 773761 bytes, 0 underruns
    0 output errors, 0 collisions, 31 interface resets
  User: Router1, line Se3, service PPP
    Active time 23:17:30, Idle time 00:00:01

  Timeouts: Absolute Idle
    Limits: - -
    Disconnect in: - -
  PPP: LCP Open, multilink Open, CHAP (local <--> local)
  Dialer: Connected to 30116, outbound
    Type is IN-BAND ASYNC, group Di3
    Cause: ip (s=192.168.0.1, d=224.0.0.5)
  IP: Local 192.168.0.1
  Bundle: Member of Router1, last input 00:00:00
  Counts: 10432 packets input, 783562 bytes, 0 no buffer
    0 input errors, 0 CRC, 0 frame, 0 overrun
    10718 packets output, 799155 bytes, 0 underruns
    0 output errors, 0 collisions, 41 interface resets
  User: Router1, line Vi1, service PPP Bundle
    Active time 23:17:30, Idle time 00:00:05

  Timeouts: Absolute Idle
    Limits: - 00:01:00
    Disconnect in: - 00:00:54
      !--- Idle-timeout is 60 seconds(1 Minute).

  PPP: LCP Open, multilink Open, IPCP
  Dialer: Connected to 30116, outbound
  Idle timer 60 secs, idle 6 secs
  Type is IN-BAND SYNC, group Di3
  IP: Local 192.168.0.1, remote 192.168.0.2
  !--- IP address assigned to the bundle
  !--- and loopback address of the remote router.
  Bundle: First link of Router1, 2 links, last input 00:00:07
  Counts: 8622 packets input, 623202 bytes, 0 no buffer
    0 input errors, 0 CRC, 0 frame, 0 overrun
    8776 packets output, 618523 bytes, 0 underruns
    0 output errors, 0 collisions, 0 interface resets

  Router2#show dialer
  Di3 - dialer type = IN-BAND SYNC NO-PARITY
  Load threshold for dialing additional calls is 1
  !--- Load threshold
  Idle timer (60 secs), Fast idle timer (20 secs)
  Wait for carrier (30 secs), Re-enable (15 secs)
  Number of active calls = 2
  Dial String Successes Failures Last DNIS Last status
  30114 3 69 00:41:45 successful
  30116 4294967293 75 00:44:00 failed
  Se2 - dialer type = IN-BAND ASYNC NO-PARITY
  Rotary group 3, priority 0
  !--- Member of interface dialer 3
  Idle timer (60 secs), Fast idle timer (20 secs)
  Wait for carrier (30 secs), Re-enable (15 secs)
  Dialer state is multilink member
  Dial reason: Multilink bundle overloaded
  !--- Interface was not the first link in the MP bundle

  Connected to 30116 (Router1)
  !--- Phone number that was dialed
  Se3 - dialer type = IN-BAND ASYNC NO-PARITY
  Rotary group 3, priority 0
  !--- Member of interface dialer 3
  Idle timer (60 secs), Fast idle timer (20 secs)
  Wait for carrier (30 secs), Re-enable (15 secs)

  Dialer state is multilink member
  Dial reason: ip (s=192.168.0.1, d=224.0.0.5)
  !--- Interface was the first link in the bundle, triggered by OSPF ALL

  !--- Routers advt packet.
  Connected to 30116 (Router1)
  ! --- Phone number that was dialed

Troubleshoot

This section provides information you can use to troubleshoot your configuration.

The following outputs were obtained from the Cisco 2511 and Cisco 2503 routers. They show the Cisco 2503 dialing to PSTN links of the Cisco 2511 router and establishing a MP connection.

  Router1#debug ppp negotiation
  PPP protocol negotiation debugging is on
  Router1#debug vtemplate
  Virtual Template debugging is on
  Router1#show debug

  PPP:
  PPP protocol negotiation debugging is on
  VTEMPLATE:
  Virtual Template debugging is on
  Oct 1 20:15:20.463: As9 LCP: I CONFREQ [Closed] id 81 len 39
  Oct 1 20:15:20.463: As9 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:15:20.467: As9 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:15:20.471: As9 LCP: MagicNumber 0x57D7985D (0x050657D7985D)
  Oct 1 20:15:20.471: As9 LCP: PFC (0x0702)
  Oct 1 20:15:20.475: As9 LCP: ACFC (0x0802)
  Oct 1 20:15:20.479: As9 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:15:20.479: As9 LCP: EndpointDisc 1 Router2 (0x130A01526F7574657232)
  Oct 1 20:15:20.483: As9 LCP: Lower layer not up, Fast Starting
  Oct 1 20:15:20.487: As9 PPP: Treating connection as a dedicated line
  Oct 1 20:15:20.487: As9 PPP: Phase is ESTABLISHING, Active Open [0 sess, 0 load]
  Oct 1 20:15:20.495: As9 LCP: O CONFREQ [Closed] id 52 len 39
  Oct 1 20:15:20.499: As9 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:15:20.499: As9 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:15:20.503: As9 LCP: MagicNumber 0x078F2456 (0x0506078F2456)
  Oct 1 20:15:20.507: As9 LCP: PFC (0x0702)
  Oct 1 20:15:20.507: As9 LCP: ACFC (0x0802)
  Oct 1 20:15:20.511: As9 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:15:20.515: As9 LCP: EndpointDisc 1 Router1 (0x130A01526F7574657231)
  Oct 1 20:15:20.519: As9 LCP: O CONFACK [REQsent] id 81 len 39
  Oct 1 20:15:20.523: As9 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:15:20.527: As9 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:15:20.527: As9 LCP: MagicNumber 0x57D7985D (0x050657D7985D)
  Oct 1 20:15:20.531: As9 LCP: PFC (0x0702)
  Oct 1 20:15:20.531: As9 LCP: ACFC (0x0802)
  Oct 1 20:15:20.535: As9 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:15:20.539: As9 LCP: EndpointDisc 1 Router2 (0x130A01526F7574657232)
  Oct 1 20:15:20.547: %LINK-3-UPDOWN: Interface Async9, changed state to up
  Oct 1 20:15:20.695: As9 LCP: I CONFACK [ACKsent] id 52 len 39
  Oct 1 20:15:20.699: As9 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:15:20.703: As9 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:15:20.707: As9 LCP: MagicNumber 0x078F2456 (0x0506078F2456)
  Oct 1 20:15:20.707: As9 LCP: PFC (0x0702)
  Oct 1 20:15:20.711: As9 LCP: ACFC (0x0802)
  Oct 1 20:15:20.711: As9 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:15:20.715: As9 LCP: EndpointDisc 1 Router1 (0x130A01526F7574657231)
  Oct 1 20:15:20.719: As9 LCP: State is Open
  Oct 1 20:15:20.723: As9 PPP: Phase is AUTHENTICATING, by both [0 sess, 0 load]
  Oct 1 20:15:20.727: As9 CHAP: O CHALLENGE id 45 len 28 from "Router1"
  Oct 1 20:15:20.739: As9 CHAP: I CHALLENGE id 40 len 28 from "Router2"
  Oct 1 20:15:20.743: As9 CHAP: O RESPONSE id 40 len 28 from "Router1"
  Oct 1 20:15:20.899: As9 CHAP: I RESPONSE id 45 len 28 from "Router2"
  Oct 1 20:15:20.903: As9 CHAP: I SUCCESS id 40 len 4
  Oct 1 20:15:20.919: As9 CHAP: O SUCCESS id 45 len 4
  !--- Call is virtualized after authentication
  Oct 1 20:15:20.923: As9 PPP: Phase is VIRTUALIZED [0 sess, 1 load]
  !--- creation of Virtual access interface 1
  Oct 1 20:15:20.935: Vi1 VTEMPLATE: Reuse Vi1, recycle queue size 0
  Oct 1 20:15:20.939: Vi1 VTEMPLATE: Set default settings with ip unnumbered
  Oct 1 20:15:21.335: Vi1 VTEMPLATE: Hardware address 0000.0c47.7c6c
  Oct 1 20:15:21.335: Vi1 PPP: Phase is DOWN, Setup [0 sess, 1 load]
  Oct 1 20:15:21.339: Vi1 VTEMPLATE: Has a new cloneblk vtemplate,

  now it has vtemplate
  !--- Banner: Cloning is in progress on virtual access interface 1
  Oct 1 20:15:21.347: Vi1 VTEMPLATE: ******** CLONE VACCESS1 *************
  Oct 1 20:15:21.351: Vi1 VTEMPLATE: Clone from Virtual-Template1
  !--- The following configuration of Virtual-template is cloned to the

  !--- Virtual-access interface.
  interface Virtual-Access1
  default ip address
  no ip address

  encap ppp
  ip unnumbered Loopback0
  no ip unnumbered Loopback0
  ip addr 192.168.0.2 255.255.255.0

  no ip add
  ip unnumbered lo 0
  ip add 192.168.0.2 255.255.255.0
  ip add 192.168.1.2 255.255.255.0

  no ip add
  ip unnumbered lo 0
  end

  Oct 1 20:15:21.367: As9 IPCP: Packet buffered while building MLP bundle interface
  Oct 1 20:15:22.319: %LINEPROTO-5-UPDOWN: Line protocol on Interface Async9,
  changed state to up
  Oct 1 20:15:23.267: As9 IPCP: Packet buffered while building MLP bundle interface
  Oct 1 20:15:24.447: Vi1 VTEMPLATE: Messages from (un)cloning ...
  192.168.0.0 overlaps with Loopback0
  Oct 1 20:15:24.823: Vi1 VTEMPLATE: Messages from (un)cloning ...
  192.168.0.0 overlaps with Loopback0
  Oct 1 20:15:24.835: %LINK-3-UPDOWN: Interface Virtual-Access1,

  changed state to up
  Oct 1 20:15:24.843: Vi1 PPP: Treating connection as a dedicated line
  Oct 1 20:15:24.847: Vi1 PPP: Phase is ESTABLISHING, Active Open [0 sess, 1 load]
  Oct 1 20:15:24.851: Vi1 LCP: O CONFREQ [Closed] id 1 len 29
  Oct 1 20:15:24.855: Vi1 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:15:24.859: Vi1 LCP: MagicNumber 0x078F3560 (0x0506078F3560)
  Oct 1 20:15:24.859: Vi1 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:15:24.863: Vi1 LCP: EndpointDisc 1 Router1 (0x130A01526F7574657231)
  Oct 1 20:15:24.879: Vi1 PPP: Phase is UP [0 sess, 1 load]
  Oct 1 20:15:24.883: Vi1 IPCP: O CONFREQ [Closed] id 1 len 10
  Oct 1 20:15:24.883: Vi1 IPCP: Address 192.168.0.2 (0x0306C0A80002)
  ! -- Asynchrornous interface 9 is added to the Virtual access interface 1

  !--- and the name of the bundle is Router2.
  Oct 1 20:15:24.891: Vi1 MLP: Added first link As9 to bundle Router2
  Oct 1 20:15:24.891: Vi1 PPP: Pending ncpQ size is 2
  Oct 1 20:15:24.895: As9 IPCP: Redirect packet to Vi1
  Oct 1 20:15:24.895: Vi1 IPCP: I CONFREQ [REQsent] id 1 len 10
  Oct 1 20:15:24.899: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 1 20:15:24.903: Vi1 IPCP: O CONFACK [REQsent] id 1 len 10
  Oct 1 20:15:24.907: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 1 20:15:24.911: As9 IPCP: Redirect packet to Vi1
  Oct 1 20:15:24.915: Vi1 IPCP: I CONFREQ [ACKsent] id 2 len 10
  Oct 1 20:15:24.919: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 1 20:15:24.919: Vi1 IPCP: O CONFACK [ACKsent] id 2 len 10
  Oct 1 20:15:24.923: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 1 20:15:25.007: Vi1 IPCP: I CONFACK [ACKsent] id 1 len 10
  !--- IP address of virtual bundle was previously obtained from the loopback

  !--- interface.
  Oct 1 20:15:25.011: Vi1 IPCP: Address 192.168.0.2 (0x0306C0A80002)
  Oct 1 20:15:25.015: Vi1 IPCP: State is Open
  !--- Adds route for virtual bundle to routing table to reach the remote router.
  Oct 1 20:15:25.039: Vi1 IPCP: Install route to 192.168.0.1
  Oct 1 20:15:25.947: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1,

  changed state to up
  Oct 1 20:15:31.199: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.0.1 on Virtual-Access1 from

  LOADING to FULL, Loading Done
  Oct 1 20:18:01.439: As10 LCP: I CONFREQ [Closed] id 61 len 39
  Oct 1 20:18:01.443: As10 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:18:01.447: As10 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:18:01.451: As10 LCP: MagicNumber 0x57DA0D94 (0x050657DA0D94)
  Oct 1 20:18:01.451: As10 LCP: PFC (0x0702)
  Oct 1 20:18:01.455: As10 LCP: ACFC (0x0802)
  Oct 1 20:18:01.455: As10 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:18:01.459: As10 LCP: EndpointDisc 1 Router2 (0x130A01526F7574657232)
  Oct 1 20:18:01.463: As10 LCP: Lower layer not up, Fast Starting
  Oct 1 20:18:01.467: As10 PPP: Treating connection as a dedicated line
  Oct 1 20:18:01.467: As10 PPP: Phase is ESTABLISHING, Active Open [0 sess, 0 load]
  Oct 1 20:18:01.475: As10 LCP: O CONFREQ [Closed] id 30 len 39
  Oct 1 20:18:01.475: As10 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:18:01.479: As10 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:18:01.483: As10 LCP: MagicNumber 0x0791992D (0x05060791992D)
  Oct 1 20:18:01.483: As10 LCP: PFC (0x0702)
  Oct 1 20:18:01.487: As10 LCP: ACFC (0x0802)
  Oct 1 20:18:01.491: As10 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:18:01.491: As10 LCP: EndpointDisc 1 Router1 (0x130A01526F7574657231)
  Oct 1 20:18:01.499: As10 LCP: O CONFACK [REQsent] id 61 len 39
  Oct 1 20:18:01.503: As10 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:18:01.507: As10 LCP: AuthProto CHAP (0x0305C22305)   Oct 1 20:18:01.507: As10 LCP: MagicNumber 0x57DA0D94 (0x050657DA0D94)
  Oct 1 20:18:01.511: As10 LCP: PFC (0x0702)
  Oct 1 20:18:01.511: As10 LCP: ACFC (0x0802)
  Oct 1 20:18:01.515: As10 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:18:01.519: As10 LCP: EndpointDisc 1 Router2 (0x130A01526F7574657232)
  Oct 1 20:18:01.703: As10 LCP: I CONFACK [ACKsent] id 30 len 39
  Oct 1 20:18:01.703: As10 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 1 20:18:01.707: As10 LCP: AuthProto CHAP (0x0305C22305)
  Oct 1 20:18:01.711: As10 LCP: MagicNumber 0x0791992D (0x05060791992D)
  Oct 1 20:18:01.715: As10 LCP: PFC (0x0702)
  Oct 1 20:18:01.715: As10 LCP: ACFC (0x0802)
  Oct 1 20:18:01.719: As10 LCP: MRRU 1524 (0x110405F4)
  Oct 1 20:18:01.723: As10 LCP: EndpointDisc 1 Router1 (0x130A01526F7574657231)

  Oct 1 20:18:01.723: As10 LCP: State is Open
  Oct 1 20:18:01.727: As10 PPP: Phase is AUTHENTICATING, by both [0 sess, 0 load]
  Oct 1 20:18:01.731: As10 CHAP: O CHALLENGE id 25 len 28 from "Router1"
  Oct 1 20:18:01.743: As10 CHAP: I CHALLENGE id 30 len 28 from "Router2"
  Oct 1 20:18:01.755: As10 CHAP: O RESPONSE id 30 len 28 from "Router1"
  Oct 1 20:18:01.851: As10 CHAP: I RESPONSE id 25 len 28 from "Router2"
  Oct 1 20:18:01.867: As10 CHAP: O SUCCESS id 25 len 4
  Oct 1 20:18:01.879: As10 CHAP: I SUCCESS id 30 len 4
  Oct 1 20:18:01.879: As10 PPP: Phase is VIRTUALIZED [0 sess, 0 load]
  Oct 1 20:18:01.891: Vi1 MLP: Added link As10 to bundle Router2
  Oct 1 20:18:02.899: %LINEPROTO-5-UPDOWN: Line protocol on Interface Async10,

  changed state to up
  Router1#
  Router2#debug ppp negotiation
  PPP protocol negotiation debugging is on
  Router2#debug ppp multilink events
  Multilink events debugging is on

  Router2#debug dialer
  Dial on demand events debugging is on
  Router2#show debug
  Dial on demand:
  Dial on demand events debugging is on

  PPP:

  PPP protocol negotiation debugging is on
  Multilink events debugging is on
  Oct 2 20:15:07.442: %SYS-5-CONFIG_I: Configured from console by console
  Oct 2 20:15:08.038: %LINK-3-UPDOWN: Interface Dialer3, changed state to up
  Oct 2 20:15:08.046: Se3 DDR: rotor dialout [priority]

  !--- Dialing Reason
  Oct 2 20:15:08.050: Se3 DDR: Dialing cause ip (s=192.168.0.1, d=224.0.0.5)

  !--- Number being dialed
  Oct 2 20:15:08.054: Se3 DDR: Attempting to dial 30116
  Oct 2 20:15:08.058: CHAT3: Attempting async line dialer script
  !--- Using chat script "test" for dialout

  test & System script: none
  Oct 2 20:15:08.066: CHAT3: process started
  Oct 2 20:15:08.070: CHAT3: Asserting DTR
  Oct 2 20:15:08.070: CHAT3: Chat script test started
  !--- Call being established; note the time elapsed for call setup.
  Oct 2 20:15:35.814: CHAT3: Chat script test finished, status = Success
  Oct 2 20:15:35.830: Di3 IPCP: Install route to 192.168.0.2
  ! -- Physical Layer (Serial Interface) is up.

  !--- Only now can PPP negotiation begin.
  Oct 2 20:15:37.818: %LINK-3-UPDOWN: Interface Serial3, changed state to up
  Oct 2 20:15:37.822: Se3 DDR: Dialer statechange to up
  Oct 2 20:15:37.822: Se3 DDR: Dialer call has been placed

  !--- PPP negotiation begins
  Oct 2 20:15:37.826: Se3 PPP: Treating connection as a callout
  !--- PPP Phase is ESTABLISHING. LCP negotiation will now occur
  Oct 2 20:15:37.826: Se3 PPP: Phase is ESTABLISHING, Active Open

  [0 sess, 0 load]
  !--- Outgoing CONFREQ with Field ID 81
  Oct 2 20:15:37.834: Se3 LCP: O CONFREQ [Closed] id 81 len 39
  Oct 2 20:15:37.838: Se3 LCP: ACCM 0x000A0000 (0x0206000A0000)

  !--- This router is requesting:
  ! -- Option: Authentication Protocol, Value: CHAP
  ! -- Option: MagicNumber (used to detect loopbacks and is always sent)
  Oct 2 20:15:37.838: Se3 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:15:37.842: Se3 LCP: MagicNumber 0x57D7985D (0x050657D7985D)
  Oct 2 20:15:37.846: Se3 LCP: PFC (0x0702)
  Oct 2 20:15:37.846: Se3 LCP: ACFC (0x0802)

  Router2#show debug
  Dial on demand:
  Dial on demand events debugging is on

  PPP:
  PPP protocol negotiation debugging is on
  Multilink events debugging is on
  Oct 2 20:15:07.442: %SYS-5-CONFIG_I: Configured from console by console
  Oct 2 20:15:08.038: %LINK-3-UPDOWN: Interface Dialer3, changed state to up
  Oct 2 20:15:08.046: Se3 DDR: rotor dialout [priority]

  !--- Dialing Reason
  Oct 2 20:15:08.050: Se3 DDR: Dialing cause ip (s=192.168.0.1, d=224.0.0.5)
  !--- Number being dialed
  Oct 2 20:15:08.054: Se3 DDR: Attempting to dial 30116
  Oct 2 20:15:08.058: CHAT3: Attempting async line dialer script
  !--- Using chat script "test" for dialout
  Oct 2 20:15:08.058: CHAT3: Dialing using Modem script:

  test & System script: none
  Oct 2 20:15:08.066: CHAT3: process started
  Oct 2 20:15:08.070: CHAT3: Asserting DTR
  Oct 2 20:15:08.070: CHAT3: Chat script test started
  !--- Call being established; note the time elapsed for call setup.
  Oct 2 20:15:35.814: CHAT3: Chat script test finished, status = Success
  Oct 2 20:15:35.830: Di3 IPCP: Install route to 192.168.0.2
  ! -- Physical Layer (Serial Interface) is up.
  !--- Only now can PPP negotiation begin.
  Oct 2 20:15:37.818: %LINK-3-UPDOWN: Interface Serial3, changed state to up
  Oct 2 20:15:37.822: Se3 DDR: Dialer statechange to up
  Oct 2 20:15:37.822: Se3 DDR: Dialer call has been placed
  Oct 2 20:15:37.826: Se3 PPP: Treating connection as a callout
  !--- PPP Phase is ESTABLISHING. LCP negotiation will now occur
  Oct 2 20:15:37.826: Se3 PPP: Phase is ESTABLISHING, Active Open

  [0 sess, 0 load]
  !--- Outgoing CONFREQ with Field ID 81
  Oct 2 20:15:37.834: Se3 LCP: O CONFREQ [Closed] id 81 len 39
  Oct 2 20:15:37.838: Se3 LCP: ACCM 0x000A0000 (0x0206000A0000)
  !--- This router is requesting:
  ! -- Option: Authentication Protocol, Value: CHAP
  ! -- Option: MagicNumber (used to detect loopbacks and is always sent)
  Oct 2 20:15:37.838: Se3 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:15:37.842: Se3 LCP: MagicNumber 0x57D7985D (0x050657D7985D)
  Oct 2 20:15:37.846: Se3 LCP: PFC (0x0702)
  Oct 2 20:15:37.846: Se3 LCP: ACFC (0x0802)
  ! -- Negotiate Maximum Receive Reconstructed Unit (MRRU)
  ! -- MRRU is the maximum packet size this end will reconstruct
  Oct 2 20:15:37.850: Se3 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:15:37.854: Se3 LCP: EndpointDisc 1 Router2
  (0x130A01526F7574657232)
  ! -- Incoming CONFREQ. ID field is 52
  Oct 2 20:15:38.162: Se3 LCP: I CONFREQ [REQsent] id 52 len 39
  Oct 2 20:15:38.166: Se3 LCP: ACCM 0x000A0000 (0x0206000A0000)
  ! -- The peer has requested:
  ! -- Option: Authentication Protocol, Value: CHAP
  ! -- Option: MagicNumber (used to detect loopbacks and is always sent)
  Oct 2 20:15:38.166: Se3 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:15:38.170: Se3 LCP: MagicNumber 0x078F2456 (0x0506078F2456)
  Oct 2 20:15:38.174: Se3 LCP: PFC (0x0702)
  Oct 2 20:15:38.174: Se3 LCP: ACFC (0x0802)
  Oct 2 20:15:38.178: Se3 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:15:38.182: Se3 LCP: EndpointDisc 1 Router1
  (0x130A01526F7574657231)
  ! -- Outgoing CONFACK for message with Field ID 52
  Oct 2 20:15:38.186: Se3 LCP: O CONFACK [REQsent] id 52 len 39

  Oct 2 20:15:38.190: Se3 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:15:38.194: Se3 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:15:38.198: Se3 LCP: MagicNumber 0x078F2456 (0x0506078F2456)
  Oct 2 20:15:38.198: Se3 LCP: PFC (0x0702)
  Oct 2 20:15:38.202: Se3 LCP: ACFC (0x0802)
  Oct 2 20:15:38.202: Se3 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:15:38.206: Se3 LCP: EndpointDisc 1 Router1
  (0x130A01526F7574657231)
  ! -- Incoming CONFACK for message with Field ID 81
  Oct 2 20:15:38.214: Se3 LCP: I CONFACK [ACKsent] id 81 len 39
  Oct 2 20:15:38.214: Se3 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:15:38.218: Se3 LCP: AuthProto CHAP (0x0305C22305)

  Oct 2 20:15:38.222: Se3 LCP: MagicNumber 0x57D7985D (0x050657D7985D)
  Oct 2 20:15:38.222: Se3 LCP: PFC (0x0702)
  Oct 2 20:15:38.226: Se3 LCP: ACFC (0x0802)
  ! -- Both sides have CONFACKed the parameters
  ! -- MRRU of 1524 bytes and the Endpoint Discriminator have been negotiated
  Oct 2 20:15:38.230: Se3 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:15:38.230: Se3 LCP: EndpointDisc 1 Router2 (0x130A01526F7574657232
  ! -- LCP negotiation complete and LCP state goes to Open
  Oct 2 20:15:38.234: Se3 LCP: State is Open
  ! -- PPP Phase is AUTHENTICATING. PPP Authentication occurs now
  ! -- Two-way authentication will be performed (indicated by the both keyword)
  Oct 2 20:15:38.238: Se3 PPP: Phase is AUTHENTICATING, by both [0 sess, 0 load]

  ! -- Outgoing CHAP Challenge.
  ! -- In LCP we had agreed upon CHAP as the authentication protocol
  Oct 2 20:15:38.238: Se3 CHAP: O CHALLENGE id 40 len 28 from "Router2"

  ! -- Incoming Challenge from peer
  Oct 2 20:15:38.398: Se3 CHAP: I CHALLENGE id 45 len 28 from "Router1"

  ! -- Incoming response from peer
  Oct 2 20:15:38.402: Se3 CHAP: I RESPONSE id 40 len 28 from "Router1"

  ! -- Outgoing Response
  Oct 2 20:15:38.410: Se3 CHAP: O RESPONSE id 45 len 28 from "Router2"
  ! -- CHAP authentication successful
  Oct 2 20:15:38.418: Se3 CHAP: O SUCCESS id 40 len 4
  Oct 2 20:15:38.538: Se3 CHAP: I SUCCESS id 45 len 4
  Oct 2 20:15:38.542: Se3 MLP: Request add link to bundle

  ! -- Virtualize Se3
  ! -- Virtual Access interface will represent the MP bundle
  Oct 2 20:15:38.542: Se3 PPP: Phase is VIRTUALIZED [0 sess, 1 load]
  Oct 2 20:15:38.546: Se3 MLP: Adding link to bundle
  Oct 2 20:15:38.550: Vi1 PPP: Phase is DOWN, Setup [0 sess, 0 load]
  Oct 2 20:15:38.558: Vi1 PPP: No remote authentication for call-out
  Oct 2 20:15:38.566: Vi1 MLP: Added to huntgroup Di3
  Oct 2 20:15:38.570: Vi1 MLP: Clone from Di3
  Oct 2 20:15:38.574: %LINK-3-UPDOWN: Interface Virtual-Access1,

  changed state to up
  Oct 2 20:15:38.578: Vi1 DDR: Dialer statechange to up
  ! -- Virtual Access Interface is up
  ! -- Negotiate LCP and PPP parameters for Virtual-Access Interface
  Oct 2 20:15:38.582: Vi1 DDR: Dialer call has been placed
  Oct 2 20:15:38.586: Vi1 PPP: Treating connection as a callout
  Oct 2 20:15:38.586: Vi1 PPP: Phase is ESTABLISHING, Active Open

  [0 sess, 0 load]
  Oct 2 20:15:38.594: Vi1 LCP: O CONFREQ [Closed] id 1 len 29
  Oct 2 20:15:38.594: Vi1 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:15:38.598: Vi1 LCP: MagicNumber 0x57D79B57 (0x050657D79B57)
  Oct 2 20:15:38.602: Vi1 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:15:38.606: Vi1 LCP: EndpointDisc 1 Router2
  (0x130A01526F7574657232
  Oct 2 20:15:38.614: Vi1 PPP: Phase is UP [0 sess, 0 load]
  Oct 2 20:15:38.618: Vi1 IPCP: O CONFREQ [Closed] id 1 len 10
  Oct 2 20:15:38.622: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  ! -- First multilink connection is brought up in the virtual access interface
  Oct 2 20:15:38.626: Vi1 MLP: Added first link Se3 to bundle Router1
  Oct 2 20:15:38.630: Di3 IPCP: Remove route to 192.168.0.2
  Oct 2 20:15:39.542: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3,

  changed state to up
  Oct 2 20:15:39.614: %LINEPROTO-5-UPDOWN: Line protocol on Interface
  Virtual-Access1, changed state to up
  Oct 2 20:15:40.614: Vi1 IPCP: TIMEout: State REQsent
  Oct 2 20:15:40.618: Vi1 IPCP: O CONFREQ [REQsent] id 2 len 10
  Oct 2 20:15:40.618: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 2 20:15:41.046: Vi1 MLP: Load (1) above threshold in bundle Router1
  Oct 2 20:15:41.046: Se2 DDR: rotor dialout [priority]
  Oct 2 20:15:41.050: Se2 DDR: Attempting to dial 30116
  Oct 2 20:15:41.054: CHAT2: Attempting async line dialer script
  Oct 2 20:15:41.054: CHAT2: Dialing using Modem script:

  test & System script: none
  Oct 2 20:15:41.062: CHAT2: process started
  Oct 2 20:15:41.066: CHAT2: Asserting DTR
  Oct 2 20:15:41.066: CHAT2: Chat script test started
  Oct 2 20:15:42.506: Vi1 IPCP: I CONFREQ [REQsent] id 1 len 10
  Oct 2 20:15:42.510: Vi1 IPCP: Address 192.168.0.2 (0x0306C0A80002)
  Oct 2 20:15:42.514: Vi1 IPCP: O CONFACK [REQsent] id 1 len 10
  Oct 2 20:15:42.518: Vi1 IPCP: Address 192.168.0.2 (0x0306C0A80002)
  Oct 2 20:15:42.530: Vi1 IPCP: I CONFACK [ACKsent] id 1 len 10
  Oct 2 20:15:42.534: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)
  Oct 2 20:15:42.538: Vi1 IPCP: ID 1 didn't match 2, discarding packet
  Oct 2 20:15:42.546: Vi1 IPCP: I CONFACK [ACKsent] id 2 len 10
  Oct 2 20:15:42.550: Vi1 IPCP: Address 192.168.0.1 (0x0306C0A80001)

  Oct 2 20:15:42.554: Vi1 IPCP: State is Open
  Oct 2 20:15:42.562: Vi1 DDR: dialer protocol up
  Oct 2 20:15:42.570: Vi1 DDR: Call connected, 4 packets unqueued,

  4 transmitted 0 discarded
  ! -- Adds route for virtual bundle to routing table to reach the remote router
  Oct 2 20:15:42.582: Di3 IPCP: Install route to 192.168.0.2
  Oct 2 20:15:48.714: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.0.2 on Dialer3
  from LOADING to FULL, Loading Done
  Oct 2 20:17:41.070: CHAT2: Chat script test finished, status = Connection timed
  out; remote host not responding
  Oct 2 20:17:41.074: Se2 DDR: disconnecting call
  Oct 2 20:17:56.074: Se2 DDR: re-enable timeout
  Oct 2 20:17:56.074: Se2 DDR: Attempting to dial 30114
  Oct 2 20:17:56.078: CHAT2: Attempting async line dialer script
  Oct 2 20:17:56.078: CHAT2: Dialing using Modem script: test & System script:

  none
  Oct 2 20:17:56.086: CHAT2: process started
  Oct 2 20:17:56.090: CHAT2: Asserting DTR
  Oct 2 20:17:56.090: CHAT2: Chat script test started
  ! -- Call is being established; note the time elapsed for call setup
  Oct 2 20:18:16.890: CHAT2: Chat script test finished, status = Success
  Oct 2 20:18:18.894: %LINK-3-UPDOWN: Interface Serial2, changed state to up
  Oct 2 20:18:18.898: Se2 DDR: Dialer statechange to up
  Oct 2 20:18:18.898: Se2 DDR: Dialer call has been placed

  ! -- PPP negotiation begins
  Oct 2 20:18:18.902: Se2 PPP: Treating connection as a callout
  Oct 2 20:18:18.906: Se2 PPP: Phase is ESTABLISHING, Active Open

  [0 sess, 0 load]
  ! -- LCP negotiation begins; Multilink parameters are also negotiated
  Oct 2 20:18:18.910: Se2 LCP: O CONFREQ [Closed] id 61 len 39
  Oct 2 20:18:18.914: Se2 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:18:18.918: Se2 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:18:18.918: Se2 LCP: MagicNumber 0x57DA0D94 (0x050657DA0D94)
  Oct 2 20:18:18.922: Se2 LCP: PFC (0x0702)
  Oct 2 20:18:18.926: Se2 LCP: ACFC (0x0802)
  ! -- Negotiate Maximum Receive Reconstructed Unit (MRRU)
  ! -- MRRU is the maximum packet size this end will reconstruct
  Oct 2 20:18:18.926: Se2 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:18:18.930: Se2 LCP: EndpointDisc 1 Router2
  (0x130A01526F7574657232)
  Oct 2 20:18:19.142: Se2 LCP: I CONFREQ [REQsent] id 30 len 39
  Oct 2 20:18:19.146: Se2 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:18:19.146: Se2 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:18:19.150: Se2 LCP: MagicNumber 0x0791992D (0x05060791992D)
  Oct 2 20:18:19.154: Se2 LCP: PFC (0x0702)
  Oct 2 20:18:19.154: Se2 LCP: ACFC (0x0802)
  Oct 2 20:18:19.158: Se2 LCP: MRRU 1524 (0x110405F4)

  (0x130A01526F7574657231)
  Oct 2 20:18:19.170: Se2 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:18:19.174: Se2 LCP: MagicNumber 0x0791992D (0x05060791992D)
  Oct 2 20:18:19.178: Se2 LCP: ACFC (0x0802)
  Oct 2 20:18:19.182: Se2 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:18:19.186: Se2 LCP: EndpointDisc 1 Router1

  (0x130A01526F7574657231)
  Oct 2 20:18:19.194: Se2 LCP: I CONFACK [ACKsent] id 61 len 39
  Oct 2 20:18:19.198: Se2 LCP: ACCM 0x000A0000 (0x0206000A0000)
  Oct 2 20:18:19.198: Se2 LCP: AuthProto CHAP (0x0305C22305)
  Oct 2 20:18:19.202: Se2 LCP: MagicNumber 0x57DA0D94 (0x050657DA0D94)
  Oct 2 20:18:19.206: Se2 LCP: PFC (0x0702)
  Oct 2 20:18:19.206: Se2 LCP: ACFC (0x0802)
  Oct 2 20:18:19.210: Se2 LCP: MRRU 1524 (0x110405F4)
  Oct 2 20:18:19.214: Se2 LCP: EndpointDisc 1 Router2

  (0x130A01526F7574657232)
  Oct 2 20:18:19.214: Se2 LCP: State is Open
  Oct 2 20:18:19.218: Se2 PPP: Phase is AUTHENTICATING, by both [0 sess, 0 load]
  Oct 2 20:18:19.222: Se2 CHAP: O CHALLENGE id 30 len 28 from "Router2"
  Oct 2 20:18:19.358: Se2 CHAP: I CHALLENGE id 25 len 28 from "Router1"
  Oct 2 20:18:19.362: Se2 CHAP: O RESPONSE id 25 len 28 from "Router2"
  Oct 2 20:18:19.382: Se2 CHAP: I RESPONSE id 30 len 28 from "Router1"
  Oct 2 20:18:19.390: Se2 CHAP: O SUCCESS id 30 len 4
  Oct 2 20:18:19.482: Se2 CHAP: I SUCCESS id 25 len 4
  Oct 2 20:18:19.486: Se2 MLP: Request add link to bundle
  Oct 2 20:18:19.486: Se2 PPP: Phase is VIRTUALIZED [0 sess, 0 load]

  !--- Virtualize Se2
  !--- Virtual Access interface will represent the MP bundle
  Oct 2 20:18:19.490: Se2 MLP: Adding link to bundle
  !--- Second multilink connection is virtualized and added to Virtual

  !--- access interface.
  Oct 2 20:18:19.494: Se2 IPCP: Route to 192.168.0.2 still needed by Vi1
  Oct 2 20:18:19.498: DDR: MLP bundle, 0 packets unqueued and discarded
  Oct 2 20:18:19.498: Vi1 MLP: Added link Se2 to bundle Router1
  Oct 2 20:18:20.482: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2,
  changed state to up

Troubleshooting Commands

Certain show commands are supported by the Output Interpreter Tool ( registered customers only) , which allows you to view an analysis of show command output.

Note:Before issuing debug commands, please see Important Information on Debug Commands.

• debug ppp negotiation - To see if a client is passing PPP negotiation; this commnad is used to check for address negotiation.


• debug ppp authentication - To see if a client is passing authentication. If you are using a Cisco IOS Software Release prior to 11.2, use the debug ppp chap command instead.


• debug ppp error - To display protocol errors and error statistics associated with PPP connection negotiation and operation.


• debug vtemplate - To display the Virtual Template cloning to form a Virtual Access interface.


• debug ppp multilink events - To see PPP multilink events debugging. Displays information about events affecting multilink groups.


• debug dialer - To display debugging information about the packets received on a dialer interface.


• show caller - Displays statistics or debug information for connections.


• show dialer - Displays general diagnostic information for interfaces configured for DDR.


• show caller user- Displays List of which user is using which modem port.


• show ppp multilink- To see the members of the multilink bundle.

Related Information

• Virtual Profiles


• Virtual Interface Template Service


• Configuring PPP and Authentication


• Configuring the NAS for Basic Dial Access


• Configuring Legacy DDR Hubs


• Displaying Caller Statistics


• Multilink PPP RFC 1717 Multilink PPP RFC 1717


• Configuring Peer to Peer DDR with Dialer Profiles


• Access Technology Support Pages


• Technical Support - Cisco Systems

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